(19)
(11) EP 0 314 512 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.11.1989 Bulletin 1989/46

(43) Date of publication A2:
03.05.1989 Bulletin 1989/18

(21) Application number: 88310195.8

(22) Date of filing: 28.10.1988
(51) International Patent Classification (IPC)4: G11B 20/14
// H03M5/14
(84) Designated Contracting States:
DE FR GB

(30) Priority: 30.10.1987 JP 275079/87

(60) Divisional application:
94200371.6 / 0603168

(71) Applicant: CANON KABUSHIKI KAISHA
Tokyo (JP)

(72) Inventor:
  • Sato, Hideaki
    Yokohama-shi Kanagawa-ken (JP)

(74) Representative: Beresford, Keith Denis Lewis et al
BERESFORD & Co. 2-5 Warwick Court High Holborn
London WC1R 5DJ
London WC1R 5DJ (GB)


(56) References cited: : 
   
       


    (54) Method for recording digital data


    (57) There is provided a digital data recording system in which digital data which is encoded by the RLL (Run Length Limited) encoding system in which code "1" does not continue is recorded onto a recording medium in accordance with an NRZL (Non Return to Zero) rule. In this system, the digital data is input, a width (T) of pulse corresponding to code "1" in the input digital data is converted into a pulse of a width (T′) larger than the pulse width, and the digital data of the converted pulse width is recorded onto the recording medium. A change amount of the pulse width is made different in accordance with the minimum number of codes "0" arranged between codes "1" and "1" in the digital data. With this system, the error rate of the digital data recorded on the recording medium can be reduced. In the case of the same error rate, the recording density can be improved.







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